1 files changed, 88 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/irq.c b/arch/arm/mach-s3c24xx/irq.c
index 2c59b2d99a81..1804e23baad3 100644
--- a/arch/arm/mach-s3c24xx/irq.c
+++ b/arch/arm/mach-s3c24xx/irq.c
@@ -784,6 +784,94 @@ static struct irq_chip s3c_irq_cam = {
 };
 
 #ifdef CONFIG_CPU_S3C2440
+/* WDT/AC97 */
+
+static void s3c_irq_demux_wdtac97(unsigned int irq,
+				  struct irq_desc *desc)
+{
+	unsigned int subsrc, submsk;
+
+	/* read the current pending interrupts, and the mask
+	 * for what it is available */
+
+	subsrc = __raw_readl(S3C2410_SUBSRCPND);
+	submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+	subsrc &= ~submsk;
+	subsrc >>= 13;
+	subsrc &= 3;
+
+	if (subsrc != 0) {
+		if (subsrc & 1) {
+			generic_handle_irq(IRQ_S3C2440_WDT);
+		}
+		if (subsrc & 2) {
+			generic_handle_irq(IRQ_S3C2440_AC97);
+		}
+	}
+}
+
+
+#define INTMSK_WDT	 (1UL << (IRQ_WDT - IRQ_EINT0))
+
+static void
+s3c_irq_wdtac97_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_WDT, 3 << 13);
+}
+
+static void
+s3c_irq_wdtac97_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_WDT);
+}
+
+static void
+s3c_irq_wdtac97_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_WDT, 3 << 13);
+}
+
+static struct irq_chip s3c_irq_wdtac97 = {
+	.irq_mask	= s3c_irq_wdtac97_mask,
+	.irq_unmask	= s3c_irq_wdtac97_unmask,
+	.irq_ack	= s3c_irq_wdtac97_ack,
+};
+
+static int s3c2440_irq_add(struct device *dev, struct subsys_interface *sif)
+{
+	unsigned int irqno;
+
+	printk("S3C2440: IRQ Support\n");
+
+	/* add new chained handler for wdt, ac7 */
+
+	irq_set_chip_and_handler(IRQ_WDT, &s3c_irq_level_chip,
+				 handle_level_irq);
+	irq_set_chained_handler(IRQ_WDT, s3c_irq_demux_wdtac97);
+
+	for (irqno = IRQ_S3C2440_WDT; irqno <= IRQ_S3C2440_AC97; irqno++) {
+		irq_set_chip_and_handler(irqno, &s3c_irq_wdtac97,
+					 handle_level_irq);
+		set_irq_flags(irqno, IRQF_VALID);
+	}
+
+	return 0;
+}
+
+static struct subsys_interface s3c2440_irq_interface = {
+	.name		= "s3c2440_irq",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_irq_add,
+};
+
+static int s3c2440_irq_init(void)
+{
+	return subsys_interface_register(&s3c2440_irq_interface);
+}
+
+arch_initcall(s3c2440_irq_init);
+
 void __init s3c2440_init_irq(void)
 {
 	unsigned int irqno;